Weird problem,need advice..
 

Whats up guys....I have a week old inferno mp9 that has about 9 tanks of fuel through it. I took the car out this afternoon to have a little fun. Everything was running great. About 30 mins into the session out of nowhere the car lost all control over the steering and throttle. I changed the batteries but still no control. I came home and checked it again and the steering would move but there was very noticeable lag. I should also mention that as soon as I turn the car on the throttle/brake servo would move back and forth extremely fast with no input from the transmitter. When I use the transmitter the throttle would work off and on but again with lag. I took the receiver out of my traxxas to see if the receiver was bad but it did the same thing. Im stumped...any ideas? Thx

Faulty servos maybe?
Since you have ruled out the RX and TX as being the troublemaker it sounds like the servos are fried.

Damn that was fast!!! lol We'll I guess I have no choice but to upgrade, time to research servos now. Thx Hitokiri!

Yeah my guess would be throttle servo. Buggies are really hard on them. Cheap ones die quick.

Yeah this is my 1st buggy so im still learning. I guess I should replace both since the steering is super slow no too. Any servo suggestions? There is a strong possibility I will try racing in the near future.

Do your self a huge favor and get som really good servos like the Xpert WR-4401 you won't regret it.

Ok cool, thx for the advice!

You are most welcome.

There are of course alot of good servos out there. Just remember it's better to have more torque/power than you really need. The less strain it will be for the servo in question.

The Expert WR servo range is 100% waterproof, in fact to such a degree it's IP67 rated which means it can be submerged in 3 ft. of water for a prolonged time and still function normally no other servo I know of has that to boast about. The WR-4401 is fast and powerful even at low voltage like 4.8V but will handle up to 6.6V. Here is a bit of reading on the WR-4401 if you are curious about it http://www.bigsquidrc.com/product-sp...erproof-servo/

Not sure what battery chemistry you use in your MP9, if you use a 2S LiPo you could hop up a notch and look at the Expert WR-6601 it will function between 4.8V and 8.4V but optimum performance will be between 6.0V and 8.4V. Or you could do total overkill if you indeed do use 2S LiPo and get the WR-7701 it has Monster torque!

Here is one place you can get them.
http://www.xpert-rc-us.com/category-s/1849.htm

Needless to say they would also be super as steering servos, I have a WR-4401 for steering in a Hong Nor Nexx8 buggy i'm in the process of getting into running condition and I plan to get a WR-6601 as steering servo for my Durango DEX408 V1 buggy as well.

Regards
Hitokiri_2000

Thx for going into detail...I have 2 4401's on the way as we speak! My car is nitro so im using alkaline batt's right now

I hope the new servos will meet your expectations.

If you want a bit more power sent to your servos you can with good results use a 2S LiFe pack. they come in a wide selection. If you don't feel safe with using LiFe type power packs you can also use a 5 cell NiMh pack.

I guess my next search should be about batteries because what you just said sounds like french to me!! LOL but thanks for all the help!

Yeah ditch the alkalines. Get a lipo or LiFe receiver pack. You will need a charger for it as well if you don't have one already.

What size, brand do you guys use/recommend? Should I get one for my transmitter too? Is the main advantage that they are rechargeable ?

What transmitter do you have?

It depends which make and model you have, if you can get a LiFe or NiMh pack that will fit inside, unless you want to do some radical changes to it.

An example is the Spektrum DX3R/S transmitter it has a holder for 4 ordinary AA batteries. I know of some, who have altered their DX3R/S so they could use a battery pack, but I do not know how difficult it is to make the changes.

What are the dimensions, of the battery/receiver compartment in your car?

www.hobbyking.com Has wide selection of different LiFe and NiMh packs, as for the NiMh packs there's pretty much two kinds, the stick pack and the hump pack. But in two different setups.
4 cell = 4.8V and 5 cell = 6V and for the LiFe type it's 2 cell = 6.6V.

As Wingracer writes, if you want to use the LiFe type batteris you need a special charger, that's compatible with charging the various types of lithium chemestry batteries, which includes LiFe, LiPo and LiIo.
If you don't have one of those already of course, even if you just stay with the NiMh type of batteries, a good charger is something you will come to value.

If you don't have a good charger already, you will find it can be very difficult what to get and what not to get. It all depends on how much you want to spend of course. I have 3 different digital chargers, all of them are easy to use where 2 are pretty much the same when speaking of the user interface, just the names are different. The third is somewhat different in how it works, but pretty much fool proff.
Not knowing your budget for a charger, if you don't have an advanced charger already.

Here is one, I would love to get my hands on.
http://www.imaxrc.com/X200AC-DC.html They have it at Hobbyking.
http://www.hobbyking.com/hobbyking/s..._US_Plug_.html
There's tons and tons of other chargers out there, but that one is pretty solid and very intuitive to use.

If you want to have a look at the review of it's predecessor, you can have a look here.
http://www.bigsquidrc.com/review-ima...ttery-charger/

Note there are a few differences between the two. The one in the review has a special multi plug based connector board, where you hook the battery onto when charging it and it's a DC only charger, so it requires an external power supply.

Where the second generation, have separated the output and balance port, but it now have a wall plug inlet. No need for an external PSU when at home, but still DC compatible for when you're at the track or out bashing which is nice.

I hope all my rambelings make just a little sense. Feel free to ask all you want. We will try to guide you to the best of our abilities.

Again thx for taking he time!! I'm currently running the stock kyosho transmitter and receiver but I will most likely upgrade to an airtronics/sanwa in the near future (probably the mt-4s). I guess what ill do right now is measure the batt compartment on the car are go from there. My main concern was the type and how powerful of a battery I should purchase, but you explained it depends on the electronics. LoL I didn't know so much went into buying a battery!!